Foreword ....................................................... xi
Preface ...................................................... xiii
About the Second Edition and Online Access ................ xiii
How to Use This Manual ..................................... xiv
Acknowledgments ............................................ xvi
Access to Current Protocols Essential Laboratory Techniques
Online .................................................... xvii
Contributors .................................................. xxi
Common Conversion Factors ................................... xxiii
Introduction ............................................. xxiii
Converting Units of Volume ............................... xxiii
Converting Temperatures ................................... xxiv
A Note About Writing Units of Measure .................... xxvii
Internet Resources ...................................... xxviii
Combining Techniques to Answer Molecular Questions ........... xxix
Introduction .............................................. xxix
Nucleic Acids ............................................. xxix
Proteins .................................................. xxxi
Whole Cells and Subcellular Structures ................... xxxii
General .................................................. xxxii
Internet Resources ...................................... xxxiii
1 Volume/Weight Measurement
1.1 Volume Measurement
Overview and Principles ............................. 1.1.1
Micropipettors ...................................... 1.1.5
Pipets .............................................. 1.1.8
Volumetric Containers .............................. 1.1.11
Burets and Graduated Cylinders ..................... 1.1.12
Cleaning Volumetric Apparatus ...................... 1.1.12
Literature Cited ................................... 1.1.14
Internet Resources ................................. 1.1.14
1.2 Weight Measurement
Overview and Principles ............................. 1.2.1
Strategic Planning .................................. 1.2.3
Safety Considerations ............................... 1.2.9
Protocols .......................................... 1.2.10
Basic Protocol 1: Measuring Mass Using a Top-
Loading Balance ................................. 1.2.10
Basic Protocol 2: Measuring Mass Using an
Analytical Balance .............................. 1.2.10
Understanding Results .............................. 1.2.10
Troubleshooting .................................... 1.2.11
Literature Cited ................................... 1.2.11
Internet Resources ................................. 1.2.11
2 Concentration Measurement
2.1 Spectrophotometry
Overview and Principles ............................. 2.1.1
Components of a Spectrophotometer ................... 2.1.4
How a Spectrophotometer Works ....................... 2.1.8
Strategic Questions ................................ 2.1.13
Strategic Planning ................................. 2.1.15
Safety Considerations .............................. 2.1.19
Protocols .......................................... 2.1.19
Basic Protocol 1: Preparation of a Standard
Curve for Dipicolinic Acid (DPA) ................ 2.1.19
Basic Protocol 2: Determination of a Standard
Curve for Dipicolinic Acid (DPA) and
Measurement of DPA Concentration in Unknown
Samples ......................................... 2.1.21
Support Protocol: Optimizing Spectrophotometer
Settings ........................................ 2.1.26
Understanding Results .............................. 2.1.27
Troubleshooting .................................... 2.1.27
Literature Cited ................................... 2.1.28
Internet Resources ................................. 2.1.28
2.2 Quantitation of Nucleic Acids and Proteins
Overview and Principles ............................. 2.2.1
Strategic Questions ................................. 2.2.7
Strategic Planning .................................. 2.2.8
Protocols: Nucleic Acid Quantification ............. 2.2.13
Basic Protocol 1: Traditional Detection of
Nucleic Acids Using Absorption Spectroscopy ..... 2.2.13
Basic Protocol 2: Microvolume Detection of
Nucleic Acids Using Absorption Spectroscopy ..... 2.2.16
Alternate Protocol 1: DNA Detection Using the
DNA-Binding Fluorochrome Hoechst 33258 .......... 2.2.19
Alternate Protocol 2: DNA and RNA Detection
with Ethidium Bromide Fluorescence .............. 2.2.20
Alternate Protocol 3: DNA Detection Using
PicoGreen dsDNA Quantitation Reagent ............ 2.2.21
Protocols: Protein Quantification .................. 2.2.25
Basic Protocol 3: Lowry Protein Assay ........... 2.2.25
Alternate Protocol 4: Lowry Protein Assay,
Reduced Volume .................................. 2.2.26
Support Protocol: Deoxycholate-Trichloroacetic
Acid (DOC-TCA) Sample Precipitation for Removal
of Interfering Compounds and Sample
Concentration ................................... 2.2.27
Basic Protocol 4: BCA Protein Assay ............. 2.2.27
Basic Protocol 5: Coomassie Blue Protein Assay
(Bradford Assay) ................................ 2.2.28
Basic Protocol 6: Traditional UV
Spectrophotometry ............................... 2.2.29
Alternate Protocol 5: Protein Quantitation
with UV Spectroscopy and Correction for Like-
Acid Contamination ............................. 2.2.29
Basic Protocol 7: Microvolume UV
Spectrophotometry ............................... 2.2.30
Protocol Common to Nucleic Acids and Proteins ...... 2.2.32
Basic Protocol 8: Gel-Based Quantitation of
Proteins and Nucleic Acids ...................... 2.2.32
Reagents and Solutions ............................. 2.2.34
Understanding Results .............................. 2.2.36
Troubleshooting .................................... 2.2.37
Variations ......................................... 2.2.38
Literature Cited ................................... 2.2.38
Key References ..................................... 2.2.39
Internet Resources ................................. 2.2.39
3 Reagent Preparation
3.1 Reagent Preparation: Theoretical and Practical
Discussions
Reagent Preparation ................................. 3.1.1
Accuracy of Weighing and Pipetting .................. 3.1.6
Use of Calibrated pH Meters ......................... 3.1.6
Avoiding Chemical and Microbial Contamination of
Reagents ............................................ 3.1.6
Preparing Reagent or Buffer Solutions ............... 3.1.7
Making Buffer Solutions ............................ 3.1.11
Literature Cited ................................... 3.1.14
Internet Resources ................................. 3.1.14
3.2 Measurement of pH
Overview and Principles ............................. 3.2.1
Equipment for Measuring pH .......................... 3.2.2
pH Electrode Care ................................... 3.2.9
Measurement of pH .................................. 3.2.11
Troubleshooting .................................... 3.2.14
Internet Resources ................................. 3.2.15
3.3 Recipes for Commonly Encountered Reagents
Introduction ........................................ 3.3.1
Recipes ............................................. 3.3.1
Literature Cited ................................... 3.3.12
Internet Resources ................................. 3.3.12
4 Cell Culture Techniques
4.1 Aseptic Technique
Overview and Principles ............................. 4.1.1
Strategic Planning .................................. 4.1.2
Safety Considerations ............................... 4.1.6
Techniques for Maintaining Aseptic Conditions ....... 4.1.7
Literature Cited ................................... 4.1.12
Internet Resources ................................. 4.1.12
4.2 Culture of Escherichia coli and Related Bacteria
Overview and Principles ............................. 4.2.1
Safety Considerations ............................... 4.2.2
Commonly Used Tools ................................. 4.2.2
Reagents ............................................ 4.2.3
Culturing Bacteria on Solid Media ................... 4.2.3
Growing Bacteria in Liquid Culture .................. 4.2.6
Analysis and Purification of Plasmid DNAs .......... 4.2.11
Storage of Cultures ................................ 4.2.22
Commonly Used Bacterial Media ...................... 4.2.23
Literature Cited ................................... 4.2.27
Internet Resources ................................. 4.2.27
5 Sample Preparation
5.1 Centrifugation
Introduction ........................................ 5.1.1
Definitions ......................................... 5.1.1
Rotors .............................................. 5.1.5
Literature Cited .................................... 5.1.8
5.2 Purification and Concentration of Nucleic Acids
Overview and Principles ............................. 5.2.1
Strategic Questions ................................. 5.2.6
Strategic Planning .................................. 5.2.7
Safety Considerations ............................... 5.2.8
Protocols ........................................... 5.2.8
Basic Protocol 1: Phenol Extraction and Ethanol
Precipitation of DNA ............................. 5.2.8
Alternate Protocol 1: Purification of Plasmid
DNA Using Silica Membrane Spin Columns .......... 5.2.10
Support Protocol 1: Precipitation of DNA Using
Isopropanol ..................................... 5.2.12
Support Protocol 2: Concentration of DNA Using
Butanol ......................................... 5.2.13
Basic Protocol 2: Single-Step RNA Isolation
from Cultured Cells or Tissues .................. 5.2.13
Alternate Protocol 2: Purification and
Concentration of RNA and Dilute Solutions of
DNA ............................................. 5.2.15
Reagents and Solutions ............................. 5.2.16
Understanding Results .............................. 5.2.17
Troubleshooting .................................... 5.2.19
Acknowledgments .................................... 5.2.21
Literature Cited ................................... 5.2.21
Internet Resources ................................. 5.2.22
6 Chromatography
6.1 Overview of Chromatography
Overview and Principles ............................. 6.1.1
Common Types of Chromatography for Purification of
Proteins ............................................ 6.1.3
Literature Cited ................................... 6.1.10
Internet Resources ................................. 6.1.10
7 Electrophoresis
7.1 Overview of Electrophoresis
Overview and Principles ............................. 7.1.1
Strategic Questions ................................. 7.1.1
General Concepts .................................... 7.1.3
Visualization of Resolved Molecules ................. 7.1.5
Imaging Resolved Molecules .......................... 7.1.6
Literature Cited .................................... 7.1.7
Internet Resources .................................. 7.1.7
7.2 Agarose Gel Electrophoresis Overview and
Principles .......................................... 7.2.1
Strategic Questions ................................. 7.2.3
Strategic Planning .................................. 7.2.3
Safety Considerations ............................... 7.2.5
Protocols ........................................... 7.2.6
Basic Protocol 1: DNA Agarose Gel
Electrophoresis .................................. 7.2.6
Basic Protocol 2: Denaturing RNA Agarose Gel
Electrophoresis ................................. 7.2.12
Reagents and Solutions ............................. 7.2.15
Understanding Results .............................. 7.2.16
Troubleshooting .................................... 7.2.19
Variations ......................................... 7.2.19
Acknowledgments .................................... 7.2.22
Literature Cited ................................... 7.2.22
Internet Resources ................................. 7.2.22
7.3 SDS-Polyacrylamide Gel Electrophoresis (SDS-PAGE)
Overview and Principles ............................. 7.3.1
Strategic Questions ................................. 7.3.7
Strategic Planning .................................. 7.3.8
Safety Considerations .............................. 7.3.10
Protocols .......................................... 7.3.11
Basic Protocol: Denaturing (SDS) Discontinuous
Gel Electrophoresis: The Laemmli Gel Method ..... 7.3.11
Support Protocol 1: Casting a Gel for Use in
Denaturing Discontinuous Electrophoresis ........ 7.3.15
Support Protocol 2: Calculating Molecular Mass .. 7.3.18
Support Protocol 3: Recrystallizing SDS ......... 7.3.20
Reagents and Solutions ............................. 7.3.21
Understanding Results .............................. 7.3.22
Troubleshooting .................................... 7.3.22
Variations ......................................... 7.3.26
Literature Cited ................................... 7.3.28
Key Reference ...................................... 7.3.28
7.4 Staining Proteins in Gels
Overview and Principles ............................. 7.4.1
Strategic Questions ................................. 7.4.2
Strategic Planning .................................. 7.4.3
Protocols ........................................... 7.4.4
Basic Protocol 1: Coomassie Blue Staining ........ 7.4.4
Alternate Protocol 1: Rapid Coomassie Blue
Staining ......................................... 7.4.5
Basic Protocol 2: Nonammoniacal Silver Staining .. 7.4.6
Alternate Protocol 2: Rapid Silver Staining ...... 7.4.7
Basic Protocol 3: Fluorescent Staining Using
SYPRO Orange or Red .............................. 7.4.8
Support Protocol: Photography of SYPRO Orange
or Red Fluorescently Stained Gels ............... 7.4.10
Reagents and Solutions ............................. 7.4.11
Understanding Results .............................. 7.4.12
Troubleshooting .................................... 7.4.13
Variations ......................................... 7.4.13
Literature Cited ................................... 7.4.14
Internet Resources ................................. 7.4.14
8 Blotting
8.1 Overview of Blotting
General Overview .................................... 8.1.1
General Considerations .............................. 8.1.3
Southern and Northern Blotting ...................... 8.1.4
Immunoblotting ..................................... 8.1.15
Literature Cited ................................... 8.1.19
Internet Resources ................................. 8.1.20
8.2 Nucleic Acid Blotting: Southern and Northern
Overview and Principles ............................. 8.2.1
Strategic Questions ................................. 8.2.4
Strategic Planning .................................. 8.2.5
Safety Considerations ............................... 8.2.7
Protocols ........................................... 8.2.7
Basic Protocol 1: Southern Blotting .............. 8.2.7
Basic Protocol 2: Northern Blotting ............. 8.2.13
Support Protocol: Assembling a Blotting
Transfer Apparatus .............................. 8.2.17
eagents and Solutions .............................. 8.2.18
nderstanding Results ............................... 8.2.20
(Troubleshooting ................................... 8.2.20
^Variations ........................................ 8.2.24
Literature Cited ................................... 8.2.24
Key References ..................................... 8.2.24
Internet Resources ................................. 8.2.24
8.3 Protein Blotting: Immunoblotting
Overview and Principles ............................. 8.3.1
Strategic Questions ................................. 8.3.7
Strategic Planning .................................. 8.3.8
Protocols .......................................... 8.3.10
Basic Protocol 1: Protein Blotting with Semidry
Systems ............................................ 8.3.11
Basic Protocol 2: Tank Transfer ................. 8.3.15
Alternate Protocol 1: Slot and Dot Blotting ..... 8.3.18
Support Protocol 1: Ponceau S Staining of
Transferred Proteins ............................ 8.3.19
Support Protocol 2: India Ink Staining of
Transferred Proteins ............................ 8.3.19
Support Protocol 3: Gold Staining of
Transferred Proteins ............................ 8.3.19
Support Protocol 4: Alkali Enhancement of
Protein Staining ................................ 8.3.20
Support Protocol 5: Fluorescent Protein Blot
Staining of Transferred Proteins ................ 8.3.20
Support Protocol 6: Viewing and Photographing
SYPRO Ruby-Stained Protein Blots ................ 8.3.22
Basic Protocol 3: Immunoprobing with Directly
Conjugated Secondary Antibody ................... 8.3.23
Alternate Protocol 2: Immunoprobing with
Avidin-Biotin Coupling to Secondary Antibody .... 8.3.25
Basic Protocol 4: Visualization with
Chromogenic Substrates .......................... 8.3.26
Alternate Protocol 3: Visualization with
Luminescent Substrates .......................... 8.3.27
Alternate Protocol 4: Fluorescent Blot
Preparation and Analysis ........................ 8.3.29
Reagents and Solutions ............................. 8.3.35
Understanding Results .............................. 8.3.37
Troubleshooting .................................... 8.3.37
Variations ......................................... 8.3.39
Literature Cited ................................... 8.3.39
Internet Resources ................................. 8.3.40
8.4 Labeling DNA and Preparing Probes
Overview and Principles ............................. 8.4.1
Strategic Planning ................................. 8.4.12
Safety Considerations .............................. 8.4.13
Protocols .......................................... 8.4.13
Basic Protocol 1: 5' End-Labeling of DNA with
T4 Polynucleotide Kinase ........................ 8.4.13
Basic Protocol 2: Labeling DNA by Nick
Translation ..................................... 8.4.15
Basic Protocol 3: Labeling DNA by Random
Primed Synthesis ................................ 8.4.17
Support Protocol: Purification of Labeled
Probes Using Gel-Filtration Spin Columns ........ 8.4.19
Reagents and Solutions ............................. 8.4.20
Understanding Results .............................. 8.4.20
Troubleshooting .................................... 8.4.20
Variations ......................................... 8.4.20
Literature Cited ................................... 8.4.22
Internet Resources ................................. 8.4.23
9 Microscopy
9.1 Conventional Light Microscopy
Parts of the Light Microscope ....................... 9.1.1
Care and Maintenance ................................ 9.1.1
Basic Principles and Definitions .................... 9.1.4
Magnification Versus Resolution ..................... 9.1.7
Getting Comfortable ................................. 9.1.9
Finding the Object to be Viewed .................... 9.1.10
Marking the Location of an Object: Secrets of the
Microscope Stage ................................... 9.1.12
A Quick Guide to Choosing from Various Optical
Techniques ......................................... 9.1.13
Kцhler Illumination: Secrets of the Substage
Condenser .......................................... 9.1.13
Oil Immersion ...................................... 9.1.16
Dark-Field, Rheinberg, Polarized-Light, Phase-
Contrast, and DIC Microscopy ....................... 9.1.19
Acknowledgments .................................... 9.1.28
Literature Cited ................................... 9.1.29
Key References ..................................... 9.1.29
Internet Resources ................................. 9.1.29
9.2 Immunofluorescence Microscopy
Overview and Principles ............................. 9.2.1
Strategic Planning .................................. 9.2.7
Safety Considerations .............................. 9.2.10
Protocols .......................................... 9.2.10
Basic Protocol 1: Processing Fibroblasts ........ 9.2.10
Basic Protocol 2: Processing Tetrahymena Cells .. 9.2.14
Alternate Protocol: Staining Cells Adhered
to Poly-L-Lysine-Coated Coverslips .............. 9.2.15
Basic Protocol 3: Visualizing the Cells ......... 9.2.16
Reagents and Solutions ............................. 9.2.19
Understanding Results .............................. 9.2.20
Troubleshooting .................................... 9.2.21
Acknowledgments .................................... 9.2.22
Literature Cited ................................... 9.2.22
Internet Resources ................................. 9.2.23
10 Enzymatic Reactions
10.1 Working with Enzymes
Introduction ....................................... 10.1.1
Overview of Enzymes ................................ 10.1.1
Handling Enzymes in the Laboratory ................. 10.1.6
Example of Setting Up an Enzymatic Reaction:
Restriction Enzymes ............................... 10.1.16
Literature Cited .................................. 10.1.21
Key References .................................... 10.1.21
Internet Resources ................................ 10.1.21
10.2 Overview of PCR
Overview and Principles ............................ 10.2.1
Strategic Planning ................................ 10.2.15
Strategic Questions ............................... 10.2.19
Safety Considerations ............................. 10.2.20
Protocols ......................................... 10.2.20
Basic Protocol: Routine PCR .................... 10.2.21
Support Protocol 1: Using Temperature
Gradients for Rapid Optimization of PCR
Cycling Conditions ............................. 10.2.26
Support Protocol 2: Titration of MgCh
Concentration .................................. 10.2.26
Reagents and Solutions ............................ 10.2.27
Understanding Results ............................. 10.2.28
Troubleshooting ................................... 10.2.29
Variations ........................................ 10.2.29
Literature Cited .................................. 10.2.32
Internet Resources ................................ 10.2.35
10.3 Real-Time PCR
Overview and Principles ............................ 10.3.1
Strategic Questions ................................ 10.3.5
Strategic Planning ................................. 10.3.7
Safety Considerations ............................. 10.3.26
Protocols ......................................... 10.3.26
Basic Protocol 1: Synthesis of cDNA by
Reverse Transcription .......................... 10.3.27
Basic Protocol 2: Real-Time PCR Amplification
and Analysis ................................... 10.3.28
Support Protocol 1: Determination of
Amplification Efficiency ....................... 10.3.31
Support Protocol 2: Analyzing Results Using
the Pfaffl Method to Calculate Fold Induction .. 10.3.32
Support Protocol 3: Serial Dilution for
Standard Curve ................................. 10.3.34
Understanding Results ............................. 10.3.35
Troubleshooting ................................... 10.3.35
Variations ........................................ 10.3.38
Literature Cited .................................. 10.3.38
Internet Resources ................................ 10.3.40
11 Bioinformatics
11.1 Using NCBI BLAST
Overview and Principles ............................ 11.1.1
Strategic Questions ................................ 11.1.5
Strategic Planning ................................. 11.1.5
Protocols .......................................... 11.1.9
Basic Protocol 1: Search a Nucleotide Database
Using a Nucleotide Query: Nucleotide BLAST
(BLASTN) ........................................... 11.1.9
Basic Protocol 2: Search a Protein Database
Using a Protein Query: Protein BLAST (BLASTP) .. 11.1.12
Basic Protocol 3: Search a Protein Database
Using a Translated Nucleotide Query: BLASTX .... 11.1.13
Basic Protocol 4: Searching a Translated
Nucleotide Database Using a Protein or
Nucleotide Query: TBLASTN and TBLASTX .......... 11.1.15
Understanding Results ............................. 11.1.16
Troubleshooting ................................... 11.1.24
Literature Cited .................................. 11.1.25
Internet Resources ................................ 11.1.26
Index
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